Charles clarence twiss



(No Model.)

No. 579,781. Patented Mar. 30, 1897.

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CHARLES CLARENCE TVISS, OF CHARLEROI, PENNSYLVANIA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 579,781, dated March30, 1897.

Application tiled January 20, 1896. Serial No. 576,242. (No model.)

To all whom it 71cm/ 0071.067472,.-

Be it known that I, CHARLES CLARENCE TWIss, a citizen of the UnitedStates, residing at Charleroi, in the county of Washington and State ofPennsylvania, have invented certain new and useful Improvements inMortise- Locks g and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification, in which- Figure l indicates a front elevation of myimproved lock. Fig. 2 is a side elevation of the same. Fig. 3 is thesame, the side being removed. Fig. 4 is the same, showing the internalmechanism locked. Figs. 5, 6, 7, 8, 9, and lO are details. Fig. 1]. is aplan of the key.

My invention relates to looks, and especially to that class calle(mortise-locks, the object being to simplify the construction, minimizethe number of parts, and lessen the cost of construction of locks ofthis general kind; and to this purpose it consists of the novelconstruction and arrangement of parts hereinafter set forth, referencebeing had to the accompanying drawings,which form part hereof.

Referring to said drawings, l is a shallow casting or box, the front ofwhich is provided with flanges o ce, which are adapted to entercorrespondingly-shaped recesses Z) b, formed in the inner face of theplate 2. r Said plate is also provided with an inwardly-projectingshoulder or flange c, beneath which the forward end of the removableside 3 of said lock is adapted to be inserted, whereby when theknob-shaft 4 projects through the orifice 5 in the inner end of ,saidlock and said lock inserted in the mortise formed in the door theremovable plate 3, the box, and plate 2 are secured together, the latterbeing screwed upon the face of the door, as shown in Fig. 2.

6 is a bolt, the portion within the case being substantially oblong andextending substantially the length of the same, the center of saidportion of which is removed and within which the tumbler and lock plateare recessed. The rear end of said bolt terminates in a yoke-shapedplate d, which terminates in upwardly and downwardly projecting ribs orflanges e e. Upon the inner edges of the upper of said flanges theupwardly and down wardly projecting iianges g g, integral with orsecured to the thimble 7, in which the knob spindle 4 projects, engage,whereby when said spindle is turned in either direction the bolt isretracted. A coil-spring S, mounted upon the pin 9 and connected to saidbolt by a link lO, serves to throw said bolt forward. One of the membersh of said spring impinges upon the upper edge of the L-shaped tumblerll, in the outer end of which is formed a notch x. Said tumbler ispivotally secured on the pin l2. A guide-plate 13, the lower end ofwhich is secured upon said pin l2 and the upper end by the pin 14C, isinterposed between said tumbler ll and the lock-'bar l5, therearwardly-projecting member of which is provided with a guide-slot e',in which the pin 16 projects. The front member at the upper end thereofis provided with a corresponding slot j, in which the pin let projects.The lower side of said front member is also provided with anupwardly-projecting lug 7o.

The operation of my device is as follows, viz: It is obvious that thelock-bolt may be reciprocated by the knob and spring without in any wiseinterfering with the lock mechanism. The key being inserted and turnedin a direction from the knob, the bit of the key straddles theguide-plate, and when substantially half of the circle is completed bythe rotation of said key the web thereof strikes the lock-plate andmoves the same forward until the outer edge ofthe same engages againstthe inner edge of the front of the bolt, as shown in Fig. 4. Thedownward pressure of the spring causes the notched end of the tumbler tobe thrown into engagement with lug 7s on the lock-bar, thereby lockingthe same and preventing the possible movement of the bolt by the knob.

It is obvious that the lock may be used either on right or left handeddoors.

IIaving described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. In combination with a sliding bolt and a lock-bar adapted to engagethe same, a tumbler adapted to engage and lock the said lockbar and aspring arranged to act by one end or limb on the said bolt and by theother end or limb the said tumbler, the tumbler and lock-bar being alsoarranged to be actuated the tnmblcrlock bar and bolt being arranged bythe key substantially as set forth. to Withdraw from their lockingpositions by 2. A xed guide-plate arranged to be stradthe backwardturning of the key substandled by the key as the latter turns, incomtially as set forth. I5

bination With a sliding bolt having a large In testimony that I claimthe foregoing I central opening, a lock-bar arranged in said hereuntoaffix my signature this 28th day of opening, and movable longitudinallyof the December, A. D. 1895.

said bolt to lock the latter, a tumbler ar- CHARLES CLARENCE TWISS. [1..s] ranged to engage a shoulder of said bolt, both In presence of-q :othe bolt and tumbler being held normally in M. E. RIGGS,

their forward position by spring-pressure and HENRY SHEETS.

